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White matter is located at the base of the brain between the cerebellum and the brainstem. It is made of long nerve fibers called axons. The axons are insulated by myelin, sheaths of fat that give the region the white color for which it is named. The myelin helps speed up the transmission of signals along the axons.
Use the models for the 3-D view. The cerebral hemispheres are made of gray matter and white matter. The gray matter is mainly neuron cell bodies and is found in two main places in the brain. The external gray matter is called the cerebral cortex, which is just below the pia. The deeper, internal gray matter masses are called nuclei.